Dennis's largest mural, at Yarram, is some 45 metres long by three metres high and took 30 days to complete. It required extensive research to assure authenticity. Its centrepiece displays the ill-fated paddle steamer Clonmel, which grounded on a sandbank in 1841 just south of what is today Port Albert. It also depicts an FE2b, a very early aircraft. When Dennis contacted the RAAF Museum at Point Cook to check on the insignia of the plane he was told there wasn't one as the aircraft predated the Air Force.